Lever



March 18 1924- J. A. BERGREN LEVER '21 24 INVENTOR.

ATTORNEY March 18; 1924.

1,487,141 J. A. BERGREN LEVER Filed 'oct. 25, 1920 2 Sheeis-Sheet 2INVENTOR.

w BY Patented ar. 18, 1924.

JOHN A. BERGBEN, or LAKE PARK, MINNESOTA, .assrenoa TO CARL E.YOUNGBERG,

or SEATTLE, WASHINGTON.

LEVER.

Application filed October 23, 1920. Serial No. 418,973.

To all whom it may concern:

Be it known that I, JOHN A. BERGREN, a citizen of the United States,residing at Lake Park, in the county of Becker, State of Minnesota, haveinvented a new and useful Improvement in Levers, of which the followingis a specification.

This invention relates to operating levers which are to be lockedagainst'the load as to movement in one or both directions, such as,.forexample, levers for operating reversing mechanisms, steam-throttlelevers, and the object is to provide a lever which is unlocked by itsinitial movement in the desired direction.

In the accompanying drawing illustrating the preferred and completeembodiment of the invention: 7

Figure 1 is a front elevation of the lever;

Fig. 2 is a side elevation thereof, indicating the support in sectionFig. 3is an enlarged vertical section on the line 3-3 of Fig. 2, withparts in the plane of section shown in elevation;

Figs. 4 and 5 are front and side elevations, respectively, of one of thelocking dogs or plungers; and

Figs. 6 and 7 are a bottom plan and elevation, respectively, of one ofthe guide nuts.

The operating arm 1, provided with handle 2, and the load arm 3, havingan eye a for attachment of the load connection 5, are fulcrumed upon astud 6, the arms havhubs 7, 8 for the purpose. Said hubs are formed,respectively, with interfitting jaws 9, 9 and 10, 10, which jaws areseen in Fig. 3 to have spaces 11 between them, permitting slight initialmovement. of the operating or power arm in either direction before iturges the load arm. A pair of lock segments 12, constituting a fixedlocking part, are supported, face to face, by pins 13, projecting fromthe base. Each segment has teeth 1 1- formed to. lock in respect tomovement in one direction while permitting latching in the oppositedirection; the teeth of the two segments being reversed. y

The cooperating locking part comprises a pair of plungers 15 passing,inlaterally offset planes, through spring chambers 16 in a block portion17 of the load arm, which juts beneath the segments. The working end 18of each plunger or dog projects from a guide opening 19in one end of itsspring-chamber into engagement with the teeth of the correspondingsegment, and is inclined upon one side and abrupt upon the other. Theother end of the plunger is guided .in the axial aperture 20 of a nut21, having a. threaded stem 22 which is screwed into this end of thechamber. The projecting head of each of these nuts is slotted, asindicated] at 28, and these slots receive laterally projecting toes 24;on the lower or rear ends of the plungers. Said toes are preferablysloped, as shown at 25, upon their outer or remote sides. The plungersare yieldingly pressed into engagement with the segments by springs 26inthe spring chambers, confined between the nuts 21 and collars 27on'the plungers. 4

The operating arm 1-has an extension 28 passing in front of the'portion17 of the load arm, and terminating in a duplex or bifurcated cam 29,having reversely inclined cam surfaces 30, constituting tripping meansarranged to act, respectively, upon the inclines 25 of the toes 24-, todisplace the respective dogs from looking engagement with the segmentsor segment.

It will thus be seen that movement of the operating arm in eitherdirection desired will not apply the power at once to the load arm, andthat this initial free movement will cause the corresponding cam surface30 to act upon the toe of the appropriate plunger dog 15, retracting thelatter, and holding it outof engagement with its segment, so that thelevercan be moved onward inthe same direction as the initial movement,to any distance desired. In this operation the other dog latches orridesidly, but isalways ready to lock against reverse movement. When thehandle is released the spring of the retraoted plunger restores it toengagement with its segment, and by pressure of the toe upon the camalso restores the jaws 9,9 of the operating arm to mid-position withrespect to the jaws 10, 10 of the load arm.

order, it is not limited thereto. Also, a single acting lever may be hadby omitting one of the segments and dogs.

. What is claimed as new is:

1. A self-unlocking lever, comprising an operating arm, a load armfulcrumed coaxially therewith, said arms having a lostmotion connectionwhereby the operating arm has initial free movement and thereafter urgesthe load arm, means including a longitudinally movable plunger forlooking the load arm, and means on the operating arm whereby the initialmovement thereof in the desired direction moves said plunger and unlocksthe load arm to permit movement thereof by continued movement of theoperating arm.

2. A self-unlocking lever, comprising an operating arm, a load arm, saidarms having concentric shoulderedhubs forming a lostmotion connectionwhereby the operating arm has initial free movement and thereafter urgesthe load arm, means for locking the load arm comprising a fixed part anda movable part connected to the load-arm, and a member connected to theoperating arm which byinitial movement of said arm in the desireddirection displaces said movable part from locking engagement with thefixed part.

3. A self-unlocking lever, comprising an operating arm, a load arm, saidarms having a lost-motion connection whereby the operating arm hasinitial free movement and thereafter urges the load arm, a lockingsegment, a longitudinally movable locking plunger connected to the loadarm, and a cam connected to the operating arm for retracting said dogthrough the initial movement of the operating arm in the desireddirection. 7

4. A self-unlocking lever, comprising an operating arm, a load arm, saidarms having a lost-motion connection whereby the operating arm hasinitial free movement and thereafter urges the load arm, a lockingsegment, a cooperating springpressed plunger connected to the load armprovided with a toe, and a cam connected to the operating armcooperative with said toe to retract the plunger through the initialmovement of' the operating arm inthe desired direction.

5. A self-unlocking lever, comprising an operating arm, a load arm, saidarms having a lost-motion connection whereby the operating arm hasinitial free movement and thereafter urges the load arm, a springchamber connected to the load arm, a locking segment, a spring-pressedlocking plunger passing through the spring chamber and having alaterally projecting toe, a slotted guide in one end of said springchamber confining said toe against turning, and a cam connected to theoperating arm to act upon said toe through initial movement of theoperating arm in the desired direction.

6. A self-unlocking lever, comprising an operating arm, a load arm, saidarms having a lost-motion connection whereby the operating arm hasinitial free movement and thereafter urges the load arm, two reverselytoothed locking segments, the teeth of each being adapted for locking inone direction and latching in the opposite direction, two dogs connectedto the load arm cooperating with the respective segments, and a duplexcam connected to the operating arm cooperating with the dogs,substantially as set forth.

7. In a device of the class described, a lever, a member movable by saidlever and having a lost motion connection therewith, means for normallyholding said member against movement in either direction, comprising apair of segments having reversely arranged teeth, and means forreleasing the member for movement in either direction by initialmovement of the lever in such direction.

8. A device of the class described having in combination, a lever andload member concentrically pivoted and having engaging hooks with a lostmotion connecting means formed thereon, a fixed locking member atoneside of said pivot, said load member extending beyond said lockingmember and carrying locking means co-operating with said member and saidlever having an ex tension projecting beyond said load member, havingmeans thereon for co-operating with said locking means to release thesame upon swingingmovement of said lever in either direction wherebymovement of said load member with said lever is permitted.

9. A device of the class described having in combination, a lever havingan intermediate hub, a pivot member upon which said hub is mounted, aload carrying member having hub mounted on said pivot and extending atone side thereof substantially parallel with one end of said lever, saidhubs being in contact and having recesses in their adjacent surfacesforming a lost motion connection therebetween, an arcuate holding memberbetween said lever and load member, a plurality of means carried by saidload member engaging said holding member to lock the load member inposition, and means carried by said lever engaging said last mentionedmeans to unlock said load member upon initial movement of said lever.

JOHN A. BERGREN.

